If 7 buses can transport 280 persons how many persons can be carried by 12 buses

What is the factored form of x2 − 4x − 5? (x + 5)(x − 1) (x + 5)(x + 1) (x − 5)(x − 1) (x − 5)(x + 1)

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n